What is a NULL scan?
A、Ascaninwhichallflagsareturnedoff
B、Ascaninwhichcertainflagsareoff
C、Ascaninwhichallflagsareon
D、Ascaninwhichthepacketsizeissettozero
E、Ascanwithanillegalpacketsize
发布时间：2025-11-29 16:53:09
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答案：A
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